Improvement in saw-sets



W. BURGESS.-

Saw-Set,

No. 169,144, 7 PatentudOct.26,l875.

WITN EgSES W QIVENTOR ATTORNEYS WARREN BURGESS, OF 'TONIOA, ILLINOIIMPROVEMEN Specification forming part of Letters Patent No. 169, 144,dated October 26, 1875; application filed A ril 24, 1875.

i T 0 all whom it may concern:

Be it known that I, WARREN BURGESS, of Tonica, in the county of La Salleand State of Illinois, have invented a new and valuable Improvement inSaw-Sets; and I do hereby declare that the following is a full, clear,and exact description of the construction and op.- eration of the same,reference being had to the annexed drawings, making a part of thisspecification, and to the letters and figures of reference markedthereon.

Figure l of the drawings is a representation of a plan view of mydevice, and Fig 2is a detail view of the same.

This invention has relation to improvements in devices for settingsaw-teeth; and it consists in the construction and novel arrangement ofthe obtuse-angled guide-bend of the main stem extending transverselyacross the face of the jaw, and ofthe notched detachable spring-jaw, incombination with the lever-stirrup, as hereinafter shown and described.

In the annexed drawings, A designates the stem or body of the implement,which is made of anysuitable metal, and is mounted, for convenience ofmanipulation, in a wooden handle, a. The free end of this stem is bentin a right line across the face of the jaw, at an obtuse angle to itslength, so that the broad base of the tooth will have a full guide inbending, which will, in a manner, fill the angle and prevent theadjacentflexible part of the saw-blade from being bent too farinthe oppositedirection, which would tend to set the tooth farther out than the gagerequires. Its extremity is provided with a screw-threaded perforation,into which is passed anadjusting, thumb-screw, b, the object and mode ofoperation of which will hereinafter be made clear. B represents a strongsteel spring, preferably of the same Width of the stem, and rigidlysecured thereto by means of a screw, 0, passing through its end into theshank. This spring gradually thickens-from its point of attachment tothe stem until it reaches its free end, where it presents a considerableenlargement,

d, the front edge of which is inclined and beveled, forming a point, e,greatly resembling the shape of a saw-tooth. This point extends somewhatbeyond the bend c of the main jaw, forming a recess to guide the toothinto the bite. It constitutes one of the jaws of my improved saw-set,the other being supplied at the angular bend e of the adjusting-arm f,and the body of the stem and spring B is forced with its point 6 againstthe other jaw of the set by the following simple and reliable mechanism:7

A lever, L, of suitable form and strength, is pivoted, by means of ascrew, 9, between two bearings, 2', so that its weight end shall reachto the angle formed by the adjustingarm and the body of the stem, itspower-arm extending rearwardly to a point where it may be convenientlyreached by the finger of the operator holding the handle in his hand.This lever is connected by means of a stirrup, D, to spring B, the saidstirrup being seated ina notch, z, in the back of the spring-jaw,embracing both the spring and the stem, and

being pivoted at j to the weight end of the lever; hence, when the powerend of the le ver L is thrust inward by the operator, its weight endwill be thrust outward, thus drawin g the spring-jaw into contact withthe rigid stem, and rigidly griping the tooth of a saw interposedbetween them, so that it may be conveniently set at any desired angle,which angle-will be increased by unscrewing the adjusting-screw b, andlessened by setting up the same. When the lever is released jaw B willautomatically open for the insertion of a second tooth.

With a view to preventing Stirrup D from slipping, it is received into acorresponding notch, z, in the back of spring-arm B, as shown in dottedlines, Fig. l. I

When the jaws require to be ground true the stirrup D is slipped out ofits notch,

screws g and c removed, and the jaws taken apart.

I am aware that a saw-set having its jaws constructed of one bent pieceof metal has a lever andamad'ustablei stirrup, as; shown asspeeifledi inLetters Patent granted to E. S. Holkins,

dated April 8, 1851, No. 8,026, and ltherem ,hereunto subscribed mynamein the presence of two witnesses.

fore lay no claimto such invention.

What I claim as QQWQQIHXQSSHQJQQQHEQ 3 by LettersPatentfls- The saw-setherein described, having the obtuse-angled jaw A, the detachable.springjaw B, notched at z, and the lever L, having l eretdfime:employed" pengmetion the; St!

m P r new? v In testimony that claiin the above I have i WARREN BURGESS.

Witnesses:

HEN-m: Gmm,

JOHN .A. WILSON.

